Cross-shell excitation in two-proton knockout: Structure of ${}^{52}$Ca

Abstract

The two-proton knockout reaction ${}^9$Be(${}^{54}$Ti,${}^{52}$Ca$+\gamma$) has been studied at 72 MeV/nucleon. Besides the strong feeding of the ${}^{52}$Ca ground state, the only other sizeable cross section proceeds to a 3${}^{-}$ level at 3.9 MeV. There is no measurable direct yield to the first excited 2${}^{+}$ state at 2.6 MeV. The results illustrate the potential of such direct reactions for exploring cross-shell proton excitations in neutron-rich nuclei and confirms the doubly-magic nature of ${}^{52}$Ca.

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